java程序实现获取计算机cpu利用率和内存使用信息的代码.docx
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java程序实现获取计算机cpu利用率和内存使用信息的代码.docx
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java程序实现获取计算机cpu利用率和内存使用信息的代码
利用java程序实现获取计算机cpu利用率和内存使用信息。
创建一个Bean用来存贮要得到的信
publicclassMonitorInfoBean{
/**可使用内存.*/
privatelongtotalMemory;
/**剩余内存.*/
privatelongfreeMemory;
/**最大可使用内存.*/
privatelongmaxMemory;
/**操作系统.*/
privateStringosName;
/**总的物理内存.*/
privatelongtotalMemorySize;
/**剩余的物理内存.*/
privatelongfreePhysicalMemorySize;
/**已使用的物理内存.*/
privatelongusedMemory;
/**线程总数.*/
privateinttotalThread;
/**cpu使用率.*/
privatedoublecpuRatio;
publiclonggetFreeMemory(){
returnfreeMemory;
}
publicvoidsetFreeMemory(longfreeMemory){
this.freeMemory=freeMemory;
}
publiclonggetFreePhysicalMemorySize(){
returnfreePhysicalMemorySize;
}
publicvoidsetFreePhysicalMemorySize(longfreePhysicalMemorySize){
this.freePhysicalMemorySize=freePhysicalMemorySize;
}
publiclonggetMaxMemory(){
returnmaxMemory;
}
publicvoidsetMaxMemory(longmaxMemory){
this.maxMemory=maxMemory;
}
publicStringgetOsName(){
returnosName;
}
publicvoidsetOsName(StringosName){
this.osName=osName;
}
publiclonggetTotalMemory(){
returntotalMemory;
}
publicvoidsetTotalMemory(longtotalMemory){
this.totalMemory=totalMemory;
}
publiclonggetTotalMemorySize(){
returntotalMemorySize;
}
publicvoidsetTotalMemorySize(longtotalMemorySize){
this.totalMemorySize=totalMemorySize;
}
publicintgetTotalThread(){
returntotalThread;
}
publicvoidsetTotalThread(inttotalThread){
this.totalThread=totalThread;
}
publiclonggetUsedMemory(){
returnusedMemory;
}
publicvoidsetUsedMemory(longusedMemory){
this.usedMemory=usedMemory;
}
publicdoublegetCpuRatio(){
returncpuRatio;
}
publicvoidsetCpuRatio(doublecpuRatio){
this.cpuRatio=cpuRatio;
}
}
之后,建立bean的接口
publicinterfaceIMonitorService{
publicMonitorInfoBeangetMonitorInfoBean()throwsException;
}
然后,就是最关键的,得到cpu的利用率,已用内存,可用内存,最大内存等信息。
importjava.io.InputStreamReader;
importjava.io.LineNumberReader;
importsun.management.ManagementFactory;
importcom.sun.management.OperatingSystemMXBean;
importjava.io.*;
importjava.util.StringTokenizer;
/**
*获取系统信息的业务逻辑实现类.
*@authorGuoHuang
*/
publicclassMonitorServiceImplimplementsIMonitorService{
privatestaticfinalintCPUTIME=30;
privatestaticfinalintPERCENT=100;
privatestaticfinalintFAULTLENGTH=10;
privatestaticfinalFileversionFile=newFile("/proc/version");
privatestaticStringlinuxVersion=null;
/**
*获得当前的监控对象.
*@return返回构造好的监控对象
*@throwsException
*@authorGuoHuang
*/
publicMonitorInfoBeangetMonitorInfoBean()throwsException{
intkb=1024;
//可使用内存
longtotalMemory=Runtime.getRuntime().totalMemory()/kb;
//剩余内存
longfreeMemory=Runtime.getRuntime().freeMemory()/kb;
//最大可使用内存
longmaxMemory=Runtime.getRuntime().maxMemory()/kb;
OperatingSystemMXBeanosmxb=(OperatingSystemMXBean)ManagementFactory
.getOperatingSystemMXBean();
//操作系统
StringosName=System.getProperty("os.name");
//总的物理内存
longtotalMemorySize=osmxb.getTotalPhysicalMemorySize()/kb;
//剩余的物理内存
longfreePhysicalMemorySize=osmxb.getFreePhysicalMemorySize()/kb;
//已使用的物理内存
longusedMemory=(osmxb.getTotalPhysicalMemorySize()-osmxb
.getFreePhysicalMemorySize())
/kb;
//获得线程总数
ThreadGroupparentThread;
for(parentThread=Thread.currentThread().getThreadGroup();parentThread
.getParent()!
=null;parentThread=parentThread.getParent())
;
inttotalThread=parentThread.activeCount();
doublecpuRatio=0;
if(osName.toLowerCase().startsWith("windows")){
cpuRatio=this.getCpuRatioForWindows();
}
else{
cpuRatio=this.getCpuRateForLinux();
}
//构造返回对象
MonitorInfoBeaninfoBean=newMonitorInfoBean();
infoBean.setFreeMemory(freeMemory);
infoBean.setFreePhysicalMemorySize(freePhysicalMemorySize);
infoBean.setMaxMemory(maxMemory);
infoBean.setOsName(osName);
infoBean.setTotalMemory(totalMemory);
infoBean.setTotalMemorySize(totalMemorySize);
infoBean.setTotalThread(totalThread);
infoBean.setUsedMemory(usedMemory);
infoBean.setCpuRatio(cpuRatio);
returninfoBean;
}
privatestaticdoublegetCpuRateForLinux(){
InputStreamis=null;
InputStreamReaderisr=null;
BufferedReaderbrStat=null;
StringTokenizertokenStat=null;
try{
System.out.println("GetusagerateofCUP,linuxversion:
"+linuxVersion);
Processprocess=Runtime.getRuntime().exec("top-b-n1");
is=process.getInputStream();
isr=newInputStreamReader(is);
brStat=newBufferedReader(isr);
if(linuxVersion.equals("2.4")){
brStat.readLine();
brStat.readLine();
brStat.readLine();
brStat.readLine();
tokenStat=newStringTokenizer(brStat.readLine());
tokenStat.nextToken();
tokenStat.nextToken();
Stringuser=tokenStat.nextToken();
tokenStat.nextToken();
Stringsystem=tokenStat.nextToken();
tokenStat.nextToken();
Stringnice=tokenStat.nextToken();
System.out.println(user+","+system+","+nice);
user=user.substring(0,user.indexOf("%"));
system=system.substring(0,system.indexOf("%"));
nice=nice.substring(0,nice.indexOf("%"));
floatuserUsage=newFloat(user).floatValue();
floatsystemUsage=newFloat(system).floatValue();
floatniceUsage=newFloat(nice).floatValue();
return(userUsage+systemUsage+niceUsage)/100;
}else{
brStat.readLine();
brStat.readLine();
tokenStat=newStringTokenizer(brStat.readLine());
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
StringcpuUsage=tokenStat.nextToken();
System.out.println("CPUidle:
"+cpuUsage);
Floatusage=newFloat(cpuUsage.substring(0,cpuUsage.indexOf("%")));
return(1-usage.floatValue()/100);
}
}catch(IOExceptionioe){
System.out.println(ioe.getMessage());
freeResource(is,isr,brStat);
return1;
}finally{
freeResource(is,isr,brStat);
}
}
privatestaticvoidfreeResource(InputStreamis,InputStreamReaderisr,BufferedReaderbr){
try{
if(is!
=null)
is.close();
if(isr!
=null)
isr.close();
if(br!
=null)
br.close();
}catch(IOExceptionioe){
System.out.println(ioe.getMessage());
}
}
/**
*获得CPU使用率.
*@return返回cpu使用率
*@authorGuoHuang
*/
privatedoublegetCpuRatioForWindows(){
try{
StringprocCmd=System.getenv("windir")
+"\\system32\\wbem\\wmic.exeprocessgetCaption,CommandLine,"
+"KernelModeTime,ReadOperationCount,ThreadCount,UserModeTime,WriteOperationCount";
//取进程信息
long[]c0=readCpu(Runtime.getRuntime().exec(procCmd));
Thread.sleep(CPUTIME);
long[]c1=readCpu(Runtime.getRuntime().exec(procCmd));
if(c0!
=null&&c1!
=null){
longidletime=c1[0]-c0[0];
longbusytime=c1[1]-c0[1];
returnDouble.valueOf(
PERCENT*(busytime)/(busytime+idletime))
.doubleValue();
}else{
return0.0;
}
}catch(Exceptionex){
ex.printStackTrace();
return0.0;
}
}
/**
*读取CPU信息.
*@paramproc
*@return
*@authorGuoHuang
*/
privatelong[]readCpu(finalProcessproc){
long[]retn=newlong[2];
try{
proc.getOutputStream().close();
InputStreamReaderir=newInputStreamReader(proc.getInputStream());
LineNumberReaderinput=newLineNumberReader(ir);
Stringline=input.readLine();
if(line==null||line.length() returnnull; } intcapidx=line.indexOf("Caption"); intcmdidx=line.indexOf("CommandLine"); introcidx=line.indexOf("ReadOperationCount"); intumtidx=line.indexOf("UserModeTime"); intkmtidx=line.indexOf("KernelModeTime"); intwocidx=line.indexOf("WriteOperationCount"); longidletime=0; longkneltime=0; longusertime=0; while((line=input.readLine())! =null){ if(line.length() continue; } //字段出现顺序: Caption,CommandLine,KernelModeTime,ReadOperationCount, //ThreadCount,UserModeTime,WriteOperation Stringcaption=Bytes.substring(line,capidx,cmdidx-1) .trim(); Stringcmd=Bytes.substring(line,cmdidx,kmtidx-1).trim(); if(cmd.indexOf("wmic.exe")>=0){ continue; } //log.info("line="+line); if(caption.equals("SystemIdleProcess") ||caption.equals("System")){ idletime+=Long.valueOf( Bytes.substring(line,kmtidx,rocidx-1).trim()) .longValue(); idletime+=Long.valueOf( Bytes.substring(line,umtidx,wocidx-1).trim()) .longValue(); continue; } kneltime+=Long.valueOf( Bytes.substring(line,kmtidx,rocidx-1).trim()) .longValue(); usertime+=Long.valueOf( Bytes.substring(line,umtidx,wocidx-1).trim()) .longValue(); } retn[0]=idletime; retn[1]=kneltime+usertime; returnretn; }catch(Exceptionex){ ex.printStackTrace(); }finally{ try{ proc.getInputStream().close(); }catch(Exceptione){ e.printStackTrace(); } } returnnull; } /**测试方法. *@paramargs *@throwsException *@authorGuoHuang */ publicstaticvoidmain(String[]args)throwsException{ IMonitorServiceservice=newMonitorServiceImpl(); MonitorInfoBeanmonitorInfo=service.getMonitorInfoBean(); System.out.println("cpu占有率="+monitorInfo.getCpuRatio()); System.out.println("可使用内存="+monitorInfo.getTotalMemory()); System.out.println("剩余内存="+monitorInfo.getFreeMemory()); System.out.println("最大可使用内存="+monitorInfo.getMaxMemory()); System.out.println("操作系统="+monitorInfo.getOsName()); System.out.println("总的物理内存="+monitorInfo.getTotalMemorySize()+"kb"); System.out.println("剩余的物理内存="+monitorInfo.getFreeMemory()+"kb"); System.out.println("已使用的物理内存="+monitorInfo.getUsedMemory()+"kb"); System.out.println("线程总数="+monitorInfo.getTotalT
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